| It is difficult to meet the discharge requirements of toxic refractory nonvolatile organic wastewater by the ordinary wastewater treatment process.Because of serious pollution on the water environment,it is urgent to explore a new treatment method for organic wastewater,which is toxic,refractory and nonvolatile.Base on the principle of hydraulic cavitation and congestion theory of gas-liquid two phase flow,the synergy technology of choking cavitation and ozone for organics treatment was designed.Ozone bubbles was effectively collapsed pass through choking section after it access into choking cavitator,surface area of ozone was increased because it was collapsed to a large number of tiny bubbles from big bubbles,the contact area between ozone and organic was increased.Numerical simulation of choking cavitation flow field under adding air was proceeded through using FLUENT.The effect of ventilation mass,inlet and back pressure of choking cavitator on choking cavitation flow field was analysed.Choking cavitation phenomenon could produced under the suitable mass ventilation.The experimental platform of combined technology of choking cavitator and oxidation was built,P-nitrophenol was disposed,the effect of degradation of P-nitrophenol by the ozone ventilation,processing time,liquid flow,back pressure of choking cavitator and initial concentration was studied.Research results shows that the synergy technology of choking cavitation and ozone could dispose toxic refractory nonvolatile organic wastewater.There is a synergistic effect between choking cavitation and ozone,the degradation rate was 47.01%,which was 1.71 times of the sum degradation rate of the two treatments alone when liquid flow rate was 2.15m3/h,back pressure was 11 kPa,initial concentration of P-nitrophenol was 10mg/L and ozone ventilation was 300L/h.It has a relatively higher influence on P-nitrophenol degradation to change ozone ventilation,processing time,back pressure of choking cavitator and the initial concentration. |
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